Automatic shield for circular saws



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Aug. IA, w23.

J. E.. LANTZ AUTOMATIC SHIELD FOR CIRCULAR sAws Filed July 22. 192'1 TTORNEYS V Laivrz, a citizen or' the United States, and

i scribed and claimed;

vide a device of the character described Vthat in the following specification, and the novel serenita aug., ia, i923. t Y f ipdtdgd i STTS ?iiiihilt JOSEPH EDWARD .LNTZVGF CHCAG, ILLINOIS.

AUroIvrA'rrosHIELn roe CIRCULAR saws'.

:,Appncanon filed :any 22, i921. serial No. 486,765.

To all wlw/m, t may concern.' i

u Y tion from the correspondingswinging guard VBe "it known that I, JosnrI-r EDWARD member embodied in the form of the device illustrated Vin Figure `1. a resident of Chicago, in the county ot Cook in carrying out my invention, 1 make use 60 and State ot' illinois, have invented a 'new` cf the usual `work siipporting table 1 which and useful Improvement in Automatic? carries a circular saw 2. A part of the latter Shields for Circular Saws, of 'which the arranged to protrude through the tabie 1 'following is a full, clear, and exact descripaboveV the upper surface thereoi" in the usual tion. j j manner. A lbracket 3 is secured to the un- 65 Y My invention relates to devices :for guardder side or the table 1 by means of bolts 4E ving saw blades to prevent injury toan opere-r the like and embodies depending arm ator, and it consists in the combinations, or side 5 provided with teeth or serrations 6- constructions and arrangements herein dein its inner side. A right angular connector 'i' has a"vertical arm 8 providedv with teeth 70 Q'adapted to mesh with the teeth 6, whereby the connector may be secured in adjusted position'with respect to thearm 5. VTo this end', the arm 5 formed witlra vertical slot 10Y and a horizontally extending slot 11. The 75 arm 8 -is formed with a vertical slot 12 having a portion thereof registering with a portion ol? the slot `11 and with a horizontal slot 13 having a portion thereon'.l registering with theverticalslot 10. Boltslaorthe li-keareproso j ected through the registering slots to maintainV the connector 7 in adjusted position with respect to the arm 5. he connector 7 has horizontally extendingarm 15 adapted to cooperate with a lateral portion 16 of a ver- 85 tical shield or housingsupporting member 17. 1Ehe portion 16 of the latter is providedwith slots 18 and bolts 19 are projected through the arm 15 into engagement with the stets to maintain the shield supporting niember in a desired position. j

The Vshield supporting member 17 has the term best seen in Figure 2 and is arranged to project througlr a slot 20 so that a portion thereofA is positioned above the upper surface oit the table 1. it shield or" housing is adjustably supported on the member 17 and comprises a bor` y portion indicated gen- Y erally at 21. The body portion 21 is :termed j Figure 1 is a side elevation oi' the device to prorideparallel spaced apart sides 22 and 100 operatively applied to: a. saw supportingV 23' joined by an integral cross member or table, V web 24:. rlhe sides QQand 23 are inwardly Figure 2 is a vertical section through porotlsetat. 25425 and arranged to strad'dle the tions of themechanism shown in Figure 1 vertical supporting member 17. inconseotherportions thereof being shown in1elequence,A the body portion 21 will be sup 105 Y An objectotl my invention is to provide a d'eviceot'. the character described that can be arranged' in a desired position with respect to a circular saw blade to keep the saw guarded vat all times. l

A further object of my invention is to procomprises relatively adjustable parts, whereby the device is suitable for use with saws of' various sizes. A further object of my invention is to provide an automatic shield for circular sawsthat can be applied to saw or work supportingl means of ordinary construction without any extensive changes lin the usual construction of the latter being required.

A fur-ther object of my invention is to provide an automatic shield for circular saws that is adapted to keep the saw blade in guarded condition when articles of various sizes are moved into engagement with the saw blade. Y

@ther objects and advantages will appear features of the invention will be particularly pointed out in the appended claims.

invention is illustrated in the accompanying drawings forming part ot this aps plication, in whichi` vation, A fr ported and may be adjusted horizontal y Figure 3 is a section along the line 3-3 ot wheny bolts 26 or the like are projected trans- Figure 1, versely through slost Qty-6 in the member 17 into engageu'ient with` slots 27 -27 Vand Q8*28 in the oifset portions of the sides 110 22 and 23. Y

The body portion 21 which forms the pri- Figure 4 is a front elevation of the mechanism shown in Figure l, and

Figure 5 is -a sideelevation ot a swingingguard member differing slightly in construcfio Vmary `guard member of the device issupplemented by pairs o t swinging guard meinbers arranged adjacent to opposite ends of the body portion in position to cover. the 'portions ol" the blade 2 engaged successively by articles of dilerent sizes. The secondary guard meiiibers at the oi'Waicl-1end or the body portion 2l are indicated at 29-29 and each 'has the 'form best seen in Figure Each ot the side members 22 and 23 is provided with a series of openings extending alongv lower edge. Corresponding openings ot the series in the sides are alined and each has a flange 3l extending outwardly therefrom. v rlhe swinging guard members 2.9-29 are arranged with their upper portions disposed between the inner Walls ol' the sides 22 and 23 so that an opening 32 in each gua-rd member is alined with an opening 3() in the adjacent side. A pin V33' is then. projected through registering openings in each guard member and in the adjacent side, whereby the -ioriner Will be pivotally attached to the latter and will normally be swung downwardly by gravity torest on the'table l. Each et the side f members 2223 has series of guide slots filland a pin 35 carried by each ot the guard members 2929 projects into one of the guide slots 34 from the adjacent side ot the body portion 29, thereby limiting the moveranged to exteiid'adjacent to the underside of the Web 24.

contact the inner Wall ot the sectioii40-and various parts of the device, the operation `Each ot the pair et guard members positioned adjacent to the rearward end oi. the body portion 21 embodies tivo sections Ll() and ll. Each section Ll() is provided With an Vopening 4t2; A pin 4:3 is projected through the openings Ll2 and a selected opening 30 in the adjacent side ot the body portionvto pivotally attach -the sections 40 to the latter. Each sectional is pivotally at-4 tachedas Vat 4d, to the cooperating sectionV 40. The section 4l has a. thickness greater than that ot'the section d0 and vis provided with .an extension 45 arranged to slidably defining a shoulder d6 againstA which Vthe section40 abuts-ivhen both sections are in.

the position indicated by the YFull lines iii lgigure 2.

From thejforegoing description of the thereof maybe readily understood. Since lthe shield supporting member 17 is attached to the bracket 3 in the manner described, it

is obvious that the former may be adjusted 'i either vertically or horizontally. rlhebody portion 2l may be adjusted horizontally. The bodyportion 2l may therefore be arranged in a desired position with respect to circularsaw blades or" various sizes.VA The guardmembers 29%29 and the sections 40* yl0 may be attached to the sides 22a-nd 23 to accommodate circular savv'V blades of. dili'erent sizes. lathen the body portion 2 1 has been arranged in a desired position with respect to the saw blade 2, alined spacing members e7-l? will be placed inalined openingsV dS--d through the sides 2.2-723, as shown in VAFigure 3, whereby engagement of theY cutting edge of the saw blade 2 VWith the guard members 29-29 is prevented.

in practice, the vWork Vto be out isfplaced ony the table l and slidablyV moved toward the Saw" bladev 2.V The guard members V29---423 will be' contacted before the Work can be-inow'ed intoV engagement .With-'the [anx rlince these members are; bentV upwardly at their, outer ends andthe Vedges thereof nearest t0 thesaw blade Yarecui'ved as shown, it is apparent that the guard members 29-29 will be moved'froin the tull line 4position indicated in Figiiie2 toward the dotted line position' as the Work is.

movedV into engagement With theV cutting W edge of the saw blade. It isV important vto l tl* tl ttl el Y' de i" oosciic iat VUic ciiivc 0 ic oWei e t.je o cach guard member 29-1-'29 is such 'that no portion ol' the cutting edge oi' the saw blade is exposed, no mattei' what the position of the guard member maybe With respect tof the body portion2jl. The extensions' 39 substantially close the space between the under side 'ot tlieiweb 2st, the inner sides otl tliewalls 22--23, andthe upper end of the ica guard members 29H29 and consequentlyV the hand YotV the operator cannot be moved'iiito contact with the vcutting edge oit the saw jblade as the Work is movedtowardV the rear .'eiid ol the body portion 2l. Y-The Worlrengaged will moved along the table l into i contact withV the pair swingingguardmembers attached tofvthe body portion 2l adjacent V.to-its rearward end. y li" the Worlr eng ged is ot suiiicient thickness, the see-` tions Vwill be contacted first and tliesecti all and ell will then be moved up'- u'ardly toward the dotted line position` in# dicatedat in'ligure 2s Atthi'stime, the

tions el have their eXtieniitiesfV contactthe Vtable l and consequently the cutting PHL errent the Worlr engaged is Ynot sufficiently thick to contact the'seetion lOwbut contacts the sectionV ll, the sections 4-0 and 41 will be moved upii'ardly as a unittoward the dotted line position indicatedat ,Y in Figure 2 and 'in censequeneethe portion of the cutting of :the saw blade 2 is guarded. V Vlirtlic/ ieee-,aai

'thatfthe guard'members positioned at the Y ures rear'gof the body portion have integral in-4 V.vardl-y extending flanges indicated at 40 and 41. along their upper edges and these flangessubstantially fill the space between the supporting member 17 and the sections 10i-LO and l1-4.1.1, i. e., they extend from the inner V.surface 4:0 40 and t1- 41 and tthe sides of the member 17 (seeFigp y 2. andv Recesses '4Q-a9 aro provided in the'inner walls of the side mem here 22-23 in position to receive the protruding portions of the pms 114. y

In the event that a board of relatively abn great length is to be cut into shorter lengths,

the guard member illustrated in Figure 5 and fdenoted Igenerally at is substituted for the right hand 'guard -member 29 when facing the `front of the device, i. e., the guard having. the socket 3S. The same re terence numerals have been used to indicate likeV parts of the guard member 5() and the Athe parts thereof that diifer from the guard member-hereinbefore described.` 1t will be observed that the guard member 50 1s cut `away as at 51 and `is provided'with an auxiliary work-engaging member 52. The latter is pivotally attached tothe guard member 50, as at 58, and carries a. pin 5ft arranged to enter a guide slot 55. Y'

The guard 50 is pivotally secured to the side 22 inplaceof the guard 29 which has the 1'ecesS--S8 therein, and cooperates with the girar-@i729 which carries the pin f3?. lt will Atherefore bri/observed that when the `guard .30 .is raised, itxwill raise theV guard 29, but that the guard 50 may drop inde- Y pendently of thefguard 29. The board to e cut intoV number ofsmall pieces is ad- `iusted so; as to dispose the long portion of the board onthe side of the guard 29, and the short portion of the board, or the piece Y, to be cnt, adjacent to the guard 50. The

board is then moved into engagement with the 4saw and in its movement, raises both the guards. Themember 52 swings upwardly with respect to the guard 50 as the board passes therebeneath, and instantly drops into the position shown in Figure 5, as soon .as the board passes. .The long portion of the board may be now moved back in ex- Vactl the same )ath as taken `when y it was "noved into engagement with the saw. The

. 4guard29 will again raise, but the guard 50 and member 52 will stay in normal position and will prevent the severed piece from movi toward the operator. It will further be notedfthat the side ofthe sawdis- Y posed adjacent to .the severed piece is protected bythe guard 50. p

It will be apparent thatvarious sized `.were forn'ierly in.

saws 2 can lie-used with the guard 21. .ln case themsaw used is small, the uiovabhf members 29- 29 and ,llfl are moved inwardly and are pivotally mounted in the openings 30 adjacent to the openings theyT y Tlememb-e 17 is also moved' inwardly with respect to the guard l so that the curved surface of the former is concentric with and Vspaced slightly from ing and adapted to cover the rear of said saw, each of said guards consisting of two members pivotally secured to each other at their ends, the free ends of one of the guards efeach set being connected to said housing, the outer member of each set being adapted to cover the cutting` edge of said saw until the work engages therewith.

2. A device ofthe type described comprising a housing adapted to receive a portion of a saw blade, and saw guards pivotally carried by said housing' and adapted to cover a portion of the cutting edge of said blade, said guards having a curved under side, and one of the guards having an angular recess therein and carrying a pivoted plate adapted to form a contiguous side with one of the sides Vof the recess, whereby said plate acts as a stop plate against the reverse movement of the board being cut.

3. A device of the type described comprising a U-shaped housing adapted to cover a portion of a saw, two pairs of guards adapted to cover the front and back of the saw edge, said guards being adjustably secured to said housing, the pair of rear guards consisting of two members pivotally secured to each other, the rear member of each rear guard being adapted to cover the exposed portion of the saw when the other member thereof is disposed in said housing.

4t. A device ofthe type described com prising a supporting surface, a U-shaped housing, two pairs of guards mounted in said housing and being adapted to cover the front of a saw, the `under side of one lof the guards being provided with a recess housing, two pairs of guards mounted in seid housing and being adapted to cover the front 01"' a` saw, sind guards being ad-` 'justably secured to seid housing, the under side of one of the guards being provided .with a recess therein `md carrying' a pivot- ;riiy n'iourited plate, said plete .being adapted i to drop by gravity so as to cause one side `hereoiV te aline with one side of Vseid recess7 thisfside extending to said supporting sur- V face.

remi

secured to eaehjoihenthe rear member ofV each guard VbeingV adapted VJdfzover the exposed portionA or member thereof is disposed in seid housing.

A device of' the type, described 1Com-,

the saw when theVV other" Y prisinge U-sheped heusin'gsidapted to cover Y a portion of sew, a prir of guffirdsfadapted to cover-bhe back ofthesaiv', Vseid guardsV heilig id iustebiy secured Vto Said hou'slng,

the rear guards consisting offtwo members plvotaiiy securedV to each other, the rear member ofneech guard hemgada'pted to cover'the eXpos'edpor-tion o-the sawlwhen' the other member 'thereof isdi sposed 'n said housing 

